Abstract
| Language | English |
|---|---|
| Number of pages | 25 |
| Journal | Computation |
| Volume | 7 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 14 Jan 2019 |
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Keywords
- light emitting diodes
- indoor positioning system
- footprint boundaries
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Optical boundaries for LED-based indoor positioning system. / Popoola, Olaoluwa Rotimi; Sinanović, Sinan; Popoola, Wasiu O.; Ramirez-Iniguez, Roberto.
In: Computation, Vol. 7, No. 1, 14.01.2019.Research output: Contribution to journal › Article
TY - JOUR
T1 - Optical boundaries for LED-based indoor positioning system
AU - Popoola, Olaoluwa Rotimi
AU - Sinanović, Sinan
AU - Popoola, Wasiu O.
AU - Ramirez-Iniguez, Roberto
PY - 2019/1/14
Y1 - 2019/1/14
N2 - Overlap of footprints of light emitting diodes (LEDs) increases the positioning accuracy of wearable LED indoor positioning systems (IPS) but such an approach assumes that the footprint boundaries are defined. In this work, we develop a mathematical model for defining the footprint boundaries of an LED in terms of a threshold angle instead of the conventional half or full angle. To show the effect of the threshold angle, we compare how overlaps and receiver tilts affect the performance of an LED-based IPS when the optical boundary is defined at the threshold angle and at the full angle. Using experimental measurements, simulations, and theoretical analysis, the effect of the defined threshold angle is estimated. The results show that the positional time when using the newly defined threshold angle is 12 times shorter than the time when the full angle is used. When the effect of tilt is considered, the threshold angle time is 22 times shorter than the full angle positioning time. Regarding accuracy, it is shown in this work that a positioning error as low as 230 mm can be obtained. Consequently, while the IPS gives a very low positioning error, a defined threshold angle reduces delays in an overlap-based LED IPS.
AB - Overlap of footprints of light emitting diodes (LEDs) increases the positioning accuracy of wearable LED indoor positioning systems (IPS) but such an approach assumes that the footprint boundaries are defined. In this work, we develop a mathematical model for defining the footprint boundaries of an LED in terms of a threshold angle instead of the conventional half or full angle. To show the effect of the threshold angle, we compare how overlaps and receiver tilts affect the performance of an LED-based IPS when the optical boundary is defined at the threshold angle and at the full angle. Using experimental measurements, simulations, and theoretical analysis, the effect of the defined threshold angle is estimated. The results show that the positional time when using the newly defined threshold angle is 12 times shorter than the time when the full angle is used. When the effect of tilt is considered, the threshold angle time is 22 times shorter than the full angle positioning time. Regarding accuracy, it is shown in this work that a positioning error as low as 230 mm can be obtained. Consequently, while the IPS gives a very low positioning error, a defined threshold angle reduces delays in an overlap-based LED IPS.
KW - light emitting diodes
KW - indoor positioning system
KW - footprint boundaries
U2 - 10.3390/computation7010007
DO - 10.3390/computation7010007
M3 - Article
VL - 7
JO - Cognitive Computation
T2 - Cognitive Computation
JF - Cognitive Computation
SN - 1866-9956
IS - 1
ER -